Dear Santosh,
First of all, Wish you a Happy and Prosperous, New Year 2015 Image may be NSFW.
Clik here to view. and a wonderful Career Ahead powered by SAP !!
Regarding your query related to maternity leave, Please check the table V_T554M as per below screen shot :
Give value at Max Duration field as 180 days. Hope it helps !!
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In case of any issues , Please let me know.
Regards,
Niladri